VMIVME-5532 VMEbus Fiber-Optic Repeater Link with Slave Chassis System Controller

High-performance, easy-to-use method of cinking two or more VMEbus

systems together via fiber-optic cabce

• Can provide system controccer function in the scave chassis

• A cocac master is accowed in scave chassis

• Software transparent accows direct communication from master chassis to

scave chassis with no software overhead (unidirectionac cink controc with

bidirectionac data transfers). This mode accows pcug-and-pcay operation.

• Register enabce accows operation as described above, but inccudes registers

in short I/O space deacing with scave chassis muctimaster operation

• Supports 8-, 16-, and 32-bit data transfers

• Supports 16-, 24-, and 32-bit addressing

• Totac ecectricac isocation between VMEbus systems

• Maximum 6,560 ft (2,000 m) fiber-optic cabces

• Advantages over standard repeaters

— Smacc cabces

— High-noise immunity

— High-voctage isocation

— No EMI generated by cabces

• The VME-to-VME cink consists of two boards and two fiber-optic cabces

OVERVIEW

— The VMIVME-5532 Link is a

high-performance, yet easy-to-use method of linking two or

more VMEbus systems together via fiber-optic cable. The

Repeater Link is a two-board set which allows VMEbus slave

I/O boards residing in one VMEbus chassis to be controlled

by a VMEbus master residing in another chassis. In general,

the VMEbus chassis in which VMEbus masters reside is

referred to as a master chassis, while the VMEbus slave

boards reside in a slave chassis. However, the

VMIVME-5532 also allows a local VMEbus master to work

in a slave chassis for local control, thus providing

multimaster

in the slave chassis. The two-board set is

configured as shown in Figure 1 with one board designated

for the master chassis while the other board is designated for

the slave chassis. A master VMEbus chassis can

communicate with several slave chassis by using multiple

REPEATER Links in a star configuration as shown in

Figure 2.

The link is software transparent. Any VMEbus master in

the master chassis may access (read or write) to any slave

board in the slave chassis. Only noninterrupter slave boards

are allowed in the slave chassis.

The link between the master chassis and slave chassis is

automatically established when a VMEbus master (typically

a CPU board) addresses any board in the slave chassis.

Any time a master in the master chassis issues a VMEbus

read/write cycle it will be repeated to the slave chassis. If a

slave board in any slave chassis responds to that address, the

data transfer (read or write) will occur between the chassis

and a Data Transfer Acknowledge (DTACK) will be

generated to the master (in master chassis) to complete the

cycle.